8000 Potential integer overflow in instrumentation.c · Issue #135177 · python/cpython · GitHub
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Potential integer overflow in instrumentation.c #135177
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Potential integer overflow in instrumentation.c#135177
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interpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error
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@rialbat
rialbat
opened on Jun 5, 2025

The arithmetic expression to * (int)sizeof(_Py_CODEUNIT) can overflow if the number of instructions in a function exceeds MAX_INT / 2, as to represents the instruction offset and sizeof(_Py_CODEUNIT) is 2.

cpython/Python/instrumentation.c

Line 1239 in 4b44b34

PyObject *to_obj = PyLong_FromLong(to * (int)sizeof(_Py_CODEUNIT));

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    interpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error

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